面曝光快速成形光固化實驗研究
發(fā)布時間：2018-08-17 18:40
【摘要】：隨著社會需求的不斷增加,人們生活質量的不斷提高,個人消費也逐步的個性化,從而對工業(yè)產品的生產不斷提出新要求。在這種產品多元化,個性化,小批量和復雜化的同時,在激烈市場競爭的驅使下,制造企業(yè)為了保持產品在市場上的競爭力,必須縮短產品的設計周期和生產周期,傳統(tǒng)的制造方法已經不能滿足這種市場需要,于是產生了快速成形技術。 快速成形技術,是當今世界上新型制造技術之一,最近在世界范圍內發(fā)展很快。它是繼數控技術之后,20世紀制造領域的又一重大突破,是當代先進制造技術的重要組成部分。 面曝光快速成形技術是快速成形技術的一種,它的工作原理是,首先將繪制或者掃描得到的三維CAD模型分層,然后以DMD或者LCD在工作面成像作為動態(tài)掩膜,對成形材料進行曝光操作。每次曝光制作一層,逐層累加,最終生成與三維CAD模型近似的實體制件,其近似程度就是快速成形系統(tǒng)的制造精度。影響制造精度的主要因素有兩個,分別是視圖發(fā)生器的光學分辨率和光敏樹脂的固化特性。 本文首先對面曝光快速成形系統(tǒng)的總體結構做了介紹,分析了快速成形系統(tǒng)中視圖發(fā)生器的組成和基本原理,提出了一種高分辨率視圖發(fā)生器的實現(xiàn)方案,采用投影儀的DMD與物鏡一體結構,有效的避免了光軸對偏導致的像面光照度不均和成像失真等問題。并在此方案的基礎上,設計了新的光學成像系統(tǒng)。在光學成像系統(tǒng)設計的過程中,使用ZEMAX軟件確定了光闌的位置,并對成像系統(tǒng)像差進行了優(yōu)化。經過成像測試實驗,結果顯示其成像精度滿足面曝光快速成形的實驗要求。 然后探討了本實驗用光敏樹脂的成分和固化原理。通過理論分析,建立了面曝光快速成形系統(tǒng)工作面的光能量分布模型,使用高斯函數和像素光強累加的辦法對工作面的光強分布進行描述,并建立了樹脂光固化的數學模型,在此基礎上計算了光敏樹脂的臨界曝光量和透射深度等參數,為進一步研究光敏樹脂的固化特性打下了基礎。 通過綜合光強分布模型和樹脂的光固化模型,預測了曝光能量、掩模寬度和固化深度,固化寬度之間的關系。通過分析實驗數據,得出光固化模型對樹脂實際固化情況模擬得較好的結論。在此基礎上建立了光敏樹脂的過固化模型,對過固化形成原因和影響過固化深度的因素進行了深入研究。通過對實驗數據的分析,找到了控制過固化深度的具體方法。 最后在本文研究的基礎上,制作了具有代表性的零件,來說明本研究的成果和實際意義。
[Abstract]:With the continuous increase of social demand, people's quality of life is constantly improving, and individual consumption is gradually individualized, thus putting forward new requirements for the production of industrial products. Competitiveness requires shortening the design and production cycles of products. Traditional manufacturing methods can no longer meet the needs of the market, so rapid prototyping technology has emerged.
Rapid prototyping (RP) is one of the new manufacturing technologies in the world, and it has developed rapidly in the world recently. It is another important breakthrough in the manufacturing field of the 20th century after NC technology, and it is an important part of the modern advanced manufacturing technology.
Surface exposure rapid prototyping technology is a kind of rapid prototyping technology. Its working principle is firstly to lay the 3D CAD model drawn or scanned, and then to use DMD or LCD as a dynamic mask to expose the forming material. The approximation degree of an approximate solid part is the manufacturing accuracy of a rapid prototyping system. There are two main factors affecting the manufacturing accuracy: the optical resolution of the view generator and the curing characteristics of the photosensitive resin.
Firstly, this paper introduces the overall structure of the face exposure rapid prototyping system, analyzes the composition and basic principle of the view generator in the rapid prototyping system, and puts forward a high resolution view generator implementation scheme. The DMD of the projector is integrated with the objective lens, which effectively avoids the image illumination caused by the optical axis offset. Based on this scheme, a new optical imaging system is designed. In the process of designing the optical imaging system, the position of the aperture is determined by ZEMAX software, and the aberration of the imaging system is optimized. Requirements for inspection.
Then the composition and curing principle of photosensitive resin are discussed. The light energy distribution model of the working face of the surface exposure rapid prototyping system is established by theoretical analysis. The light intensity distribution of the working face is described by the method of Gaussian function and pixel light intensity accumulation, and the mathematical model of resin curing is established. The critical exposure and transmission depth of photosensitive resin were calculated, which laid a foundation for further study of curing characteristics of photosensitive resin.
The relationship among exposure energy, mask width, curing depth and curing width was predicted by combining the light intensity distribution model with the resin curing model. By analyzing the experimental data, it was concluded that the light curing model could simulate the actual curing situation of the resin better. On this basis, the supercuring model of the photosensitive resin was established, and the super-curing model of the photosensitive resin was used for the overcuring. The formation reasons and the factors affecting the depth of overcure were studied in depth. Through the analysis of the experimental data, the concrete methods to control the depth of overcure were found.
Finally, on the basis of this study, representative parts are made to illustrate the results and practical significance of this study.
【學位授予單位】：西安工程大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH16
本文編號：2188544
[Abstract]:With the continuous increase of social demand, people's quality of life is constantly improving, and individual consumption is gradually individualized, thus putting forward new requirements for the production of industrial products. Competitiveness requires shortening the design and production cycles of products. Traditional manufacturing methods can no longer meet the needs of the market, so rapid prototyping technology has emerged.
Rapid prototyping (RP) is one of the new manufacturing technologies in the world, and it has developed rapidly in the world recently. It is another important breakthrough in the manufacturing field of the 20th century after NC technology, and it is an important part of the modern advanced manufacturing technology.
Surface exposure rapid prototyping technology is a kind of rapid prototyping technology. Its working principle is firstly to lay the 3D CAD model drawn or scanned, and then to use DMD or LCD as a dynamic mask to expose the forming material. The approximation degree of an approximate solid part is the manufacturing accuracy of a rapid prototyping system. There are two main factors affecting the manufacturing accuracy: the optical resolution of the view generator and the curing characteristics of the photosensitive resin.
Firstly, this paper introduces the overall structure of the face exposure rapid prototyping system, analyzes the composition and basic principle of the view generator in the rapid prototyping system, and puts forward a high resolution view generator implementation scheme. The DMD of the projector is integrated with the objective lens, which effectively avoids the image illumination caused by the optical axis offset. Based on this scheme, a new optical imaging system is designed. In the process of designing the optical imaging system, the position of the aperture is determined by ZEMAX software, and the aberration of the imaging system is optimized. Requirements for inspection.
Then the composition and curing principle of photosensitive resin are discussed. The light energy distribution model of the working face of the surface exposure rapid prototyping system is established by theoretical analysis. The light intensity distribution of the working face is described by the method of Gaussian function and pixel light intensity accumulation, and the mathematical model of resin curing is established. The critical exposure and transmission depth of photosensitive resin were calculated, which laid a foundation for further study of curing characteristics of photosensitive resin.
The relationship among exposure energy, mask width, curing depth and curing width was predicted by combining the light intensity distribution model with the resin curing model. By analyzing the experimental data, it was concluded that the light curing model could simulate the actual curing situation of the resin better. On this basis, the supercuring model of the photosensitive resin was established, and the super-curing model of the photosensitive resin was used for the overcuring. The formation reasons and the factors affecting the depth of overcure were studied in depth. Through the analysis of the experimental data, the concrete methods to control the depth of overcure were found.
Finally, on the basis of this study, representative parts are made to illustrate the results and practical significance of this study.
【學位授予單位】：西安工程大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH16
【引證文獻】
相關碩士學位論文 前1條
1 楊根;面曝光快速成形制作參數優(yōu)化研究[D];西安工程大學;2012年
，本文編號：2188544
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